Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Effects of Blood Sampling Stress on Hormone Levels in the Semipalmated Sandpiper (Efecto de la tensión, en los niveles hormonales causada por el manejo y sangramiento de individuos de Calidris pusilla)

Cheri L. Gratto-Trevor, Lewis W. Oring and Albert J. Fivizzani
Journal of Field Ornithology
Vol. 62, No. 1 (Winter, 1991), pp. 19-27
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513598
Page Count: 9
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Blood Sampling Stress on Hormone Levels in the Semipalmated Sandpiper (Efecto de la tensión, en los niveles hormonales causada por el manejo y sangramiento de individuos de Calidris pusilla)
Preview not available

Abstract

We examined the effects of handling and blood sampling stress on circulating levels of prolactin, corticosterone, testosterone, progesterone, and estradiol in Semipalmated Sandpipers (Calidris pusilla). Experimental birds were captured in nest traps, immediately bled once, then restrained for 15 or 30 min and bled again. Effects of restraint and bleeding on hormone levels were variable. Plasma corticosterone levels increased significantly in all experimental birds. In experimental birds, elevated testosterone and prolactin levels were decreased, while low values of testosterone increased. Such a response to handling would only suppress the detection of slight differences in mean hormone levels between breeding stages, and would not create artifactual differences where none actually exist. There was no relationship between sampling time and levels of prolactin, testosterone, progesterone, and estradiol in nonexperimental (less stressed) birds. /// Estudiamos en individuos de Calidris pusilla el efecto de la tensión, en los niveles circulatorios de prolactina, corticosterona, testosterona, progesterona y estradiol causada por el manejo y sangramiento de pájaros. Las aves fueron capturadas colocando trampas en sus nidos, de inmediato eran sangradas, luego sostenidas por períodos de 15 ó 30 mins. y sangradas nuevamente. El efecto de sostener a las aves y sangrarlas, en los niveles hormonales, resultó ser variable. Los niveles de corticosterona aumentaron significativamente en todas las aves experimentales. Por su parte, los niveles elevados de testosterona y prolactina se redujeron. En individuos donde los niveles de testosterona fueron bajos de primera instancia, éstos aumentaron. Dicha respuesta a la manipulación tan solo suprime la detección de pequeñas diferencias en los niveles promedios de las hormonas durante etapas reproductivas, y no establece diferencias ficticias en donde éstas no existen. No se encontró relación entre la hora en que se toman las muestras y los niveles de las hormonas antes mencionadas en aves no-experimentales (menos expuesta a tensión).

Page Thumbnails

  • Thumbnail: Page 
19
    19
  • Thumbnail: Page 
20
    20
  • Thumbnail: Page 
21
    21
  • Thumbnail: Page 
22
    22
  • Thumbnail: Page 
23
    23
  • Thumbnail: Page 
24
    24
  • Thumbnail: Page 
25
    25
  • Thumbnail: Page 
26
    26
  • Thumbnail: Page 
27
    27